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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '005f68ff3f1a39e73631e3f00dc7e6b698576f0ea824e3b47a9851a7a5c033d9' 
  AND token = 'gIgEbVhO5arzV+bLaLm8WwovxC6cihibBBa3kf6eBCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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