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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb382b44f3fbd41caecbd1fb0e18a06c40efe13279677fd6afcf501df6a7e851' 
  AND token = 'WGndMAmoBFOD4HheRrnjO5uLzJ8SKRZduT3Cam1FQWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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