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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '791c824aebe54857495cb3608505d5e4bab427d7b36d0ae91d1d9be098dd46e5' 
  AND token = 'LA3GvKcuxtvdiZFB9YDlRXSKJ9+sF2Op94vAM2xYJ1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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