SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f157e029b0ba19b11641ed90f3fc5c8330920944632af3cb9e7703d9e2d69118' 
  AND token = 'JBkmcmn4+2hTz1/dqwCj8mFPbrrRhl2LPMl/KNM9kS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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