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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a44478e89488fd28f2543faf2e2eb775c65212a4d5f76c461aa8f9d7c9e075b1' 
  AND token = 'NOxOYbG2lVHELiK3yQACAha60v9WzpjmWHLiYx64VpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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