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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2751b60b9e96d90a80084f503cbc1c8883d97c24ac1523255b125fca03f70be' 
  AND token = 'lqVoacH+56N20Vf5STM/v0MtwmZGr4IYZgE07APZ7wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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