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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '81dcbbbeb7da47c5e05a39c8868e5888312a622e042f7ba30af66a583a644b60' 
  AND token = 'SuzekLaDDlM+HUuarSBRCFYqdePf3F1cm54t3RR+Vbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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