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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aebf5d82bf3bfe8a1d5a0fd9c10b1f0a9812397f554975ff797d5686223a79a' 
  AND token = 'qciMeNfaol5Gc+ZtFMmo5GTYIhkHA2nx8iqiU2LnYB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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