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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d228a550d618e6c1540d819adb7ad446bbe37ad2ccab73f847fe1a35575aebc' 
  AND token = 'KrSXDtysfmYLYfCW1jaAGEfF5zt/m6vzEx+oNHsGsoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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