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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de9844bea623d7234e78215453e6368c2c262d58f0e8182331243d2a8cf4a81f' 
  AND token = 'ZAebOsCQaai0/zXw4q+IG66t2qMc0WZ87U+eidie9bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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