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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '959858a1ad85c16d16dd62de37816cbd2326e394ec97e3c6977345eb69e98550' 
  AND token = 'ZrF0hB4sHOWnemwBgWStbq5iHrbTamZ2UYy5SS78o0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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