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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3989e6734700e58fb7e95e2b818ecee925ac18ea024238c9dfe945b0925464b3' 
  AND token = 'aqhhw8C7gTpBwuqPyDb16I8S+sJe2Ld4nC38lT8wkNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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