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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0aa107b11eb58e3641fde417a1ed01bc2fb6b019d60c9ae5b1a153d4b72e61d0' 
  AND token = 'y7ZeUZ2Ki7D82RksVpjuf1wCer6NJ89xk1qQcdv9uLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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