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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91229d54862464d6d4be656cad7a91725c1dee3dcc8f27b59ca964d9248c5179' 
  AND token = '1PR7bahf0WGZnAUoUluaCKa9bdi+oMGbSKR/gO6uDpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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