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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfa762ebd0647bc0d064f045dacd07a030cab06bc27b7181e5b8d6d4811e1dad' 
  AND token = '3UWy3agXsBb/DQm2DWLzPAF8gLdi4JD2w93L22gPDfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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