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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50d561727e8a9e293a0124f934e4a840402c8e623c1000591ccba7c993d00d74' 
  AND token = 'bXpjEZK1kyjGzzdieywZzObon5ns56KVXLys4ZVKEyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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