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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55878e5cecdde1cb464d1ccc8324af5250e0ad1e6efb79c1e33f60254448ffb1' 
  AND token = 'yePK5MXEhq+qg0V9CiWwCIBrhk5Il9LXlctaNvgmE8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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