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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f256ab8ca5f51aaf86530ba2e41e1f7d749dc838218cfebaacac070471387de' 
  AND token = 'ZY7RaqO9xF5qzU7fD7mn9CmoL4FM1IX3eu67HwikdXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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