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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a308201853db1d5ec17ce22bd048a0879b2ba48f81b03660aaef6ed8f62ba9e2' 
  AND token = 'hX/lM4ifyJtF2or3irHRR98Fz/Gc0evjjcfJqgFFuLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}