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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe6e98d80ba340f5ac8840f3e8ef40491961e108351fb6b6b576724a0e149e61' 
  AND token = 'vRUbtMOpsF0wxb8+WA5gOK+Xq7uSdIophHuplHoIG3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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