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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '812250c291689cab48872eba597a66307bf51807dd7a4615a7a0d3b01cceff73' 
  AND token = 'uD5CEmJXKpnxyKdoTWuMQBp8lTgqnCQ+J8WW2COkWC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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