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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5406334c94f3ec75adadd08ded426d068820e67e34462e6cd9838a92af02b75b' 
  AND token = 'ySR69unuSqsahmoQSmrghaqJ+4r08a+JIy93u4jGPRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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