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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '718978b910d1562bd76ecbb286757c61399b0769e0ba7e5658dead9c13cf8c78' 
  AND token = 'HeJqJqwJzuSeVV6iU9J8eVY7vFrmNhCGYF3T+eLYAr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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