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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ced7577db686c8f7419906c4437e1f3f1aced88aa137ecb7e5db0b62fcd57d36' 
  AND token = '5k1wxs0gwylfN2nfKQD+qfRJCXp+COE+ItHd1tXt/Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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