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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '150edcee822305afc3b58c9934873683220c630606e1af6dd6f85aa45c2efd99' 
  AND token = 'B87rCyBk6lddoZiW+NKacRyQYbM3Tb+I75A1uOnF94k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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