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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c6eec34608c0732c1bfb0c1f8fa96fd414a4ad14f079f8375d15c2073964b73' 
  AND token = 'JL/i/j+nP+K/WOhPcMv6Pev1MJIPTVr5TcISv3827mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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