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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc625b3e146bf513b4c128a0f0a89ab8861b8a1ef88c89fbf1d046b2eccb99de' 
  AND token = 'liIqDT+RD9FjLU62a5bUw1hoqAZUlNm3jFvvi2Vq/sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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