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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c366ec5dcf81235416b9736d1b457d67ad8b5c14d2dcf4d7e79c889c05bb9061' 
  AND token = 'UR1BIxiwTWTGe2Z0SJY7jHieJD4FMsai+T9OD3D+L8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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