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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ee0c7d27b2cc8da74aed4403b3ea48e0e21b3db49d0cd95b034c72f3df27a0f' 
  AND token = 'MbTtwOUtYzgX9HZRa6pN22LAquBinqNhozgQpJu1WR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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