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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1aa374a601cba8a5b7b4ba62a61e1d7a56b96008805719de12a86156010da96' 
  AND token = 'LKFirHMcL5jTREghzSI/CS/5OZe1hG/9rZVub4d0Xo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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