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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6047906b38ec72b9cc20a3594e50ebcb3c5cb8560f1064a51d0e17e6c587a007' 
  AND token = 'FBRvTM0Ah8X1uiG7HByIEzat5bY0f/MsyPTdyn6v72I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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