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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d49e42daa94421c5c0cbbb84ebfae7d7ad2dc7f04c5e62c85c3e7b2dccd6467' 
  AND token = '6HrD+PAbQC7VFOJ6DSwIllEyHTDD3GweYx6T3aCTMVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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