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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f201c970e9dce188f487fded00a1d5d926402049aa7dde72927bb9bfea59f32' 
  AND token = 'R8oemIvGnn9se5XTiOZFlyHbjwP49U5CWzxhhLmXK90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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