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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02d039efa23c9e93a538a33b2e12110e5606c10d6f5491d8e9b310e7e8a73026' 
  AND token = 't5OjCOlBaOc9EKiGoxKPCFbZvA8Cer2eIcQd7EjVnKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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