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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fd6a167e540bc32e288bc17b9e7e1809c59b3e3f1b4cc60e36ad8f2b02e8f76' 
  AND token = 'Hhe6gjfngTcFoGa1ya0Am+pETweIdWsmj5o0rHKeUpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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