SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3daeccd1375f90946d5974f91f44b3805ae5f322898e367b24aea632b5456f91' 
  AND token = 'sIc/BAGe/1LVFq8skJwymE0Qj4RXi0o3r2bhZaxqbB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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