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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '607378d792b34b740cc469db5928352b5fb0b42325a2eb0b94b3f73bcbc31bef' 
  AND token = '28/oSk2svqrrclDm8llJJ+GQAmLkNm9tDWv3mUp3c4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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