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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93eec2218ac3bde2e366ac64bf6f6ec37da7deaacfc87bff4c223d0f936a4f56' 
  AND token = 'UDsVIfmpqXJP3S+dqR+r0RNomcbnY+E6nI9LXHw4v9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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