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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ddf5c6ab0079fdeb9f41d6e889f4b40f933422bbc4b4a35ff8804a120ffb510' 
  AND token = 'AW6E/npdAdeVSko4YU+7OU37MIz/qv+FllXVO7lT0O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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