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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ff1d4238cbf4b4fd9634e5e06242b665994718a9e8ccb13f36dffdbc29e700a' 
  AND token = 'a6TQ1TLO7Uv6vUORyX7rl2gYfjEBdMrHKs0BjjDAJg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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