SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1a1c561dfd86ddd77f9694cdf9cf6a32345ce03bc0802a81925664346d93649' 
  AND token = 'Sz7ptAiP9ixKBD+nxY+0KRh5GP4p3LP+6TBOzxzL+sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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