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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3a4a34aaaca18aa0aec489d69da912eefca261ed0648f9f1b648bb7fe58184b' 
  AND token = 'XUDG7bvl3jO09Mv9NDUyCbenA/xtwSa+E7n+mjwRp8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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