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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b9c48b8ca7d9c9140d6b79469ad52326671e6add919fc70418181d97aca68d0' 
  AND token = 'J0Y2eOgOvkolCgthq821YpKV7Rsvmdlv3Jwb18HRnUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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