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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '524d6e4eb6fe34f79f1a4bc20391074fcbd618f9844acf63290f5abaaef41531' 
  AND token = 'V+7Q4+n76FMtMNrB9moSgEUytHE6zDpJLozUqk2w96k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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