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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38c3c38b999fe1f9b8ee93485e99303f07d491c92b8f5f64178e8ae1b6dca4fb' 
  AND token = 'eRP/6+Ybn09eqBkeFLMrVB6/3aQmnmso7DbBNqzPu48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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