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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc860648ce1fe26d632a668b8e63b2e0ac9363ae6da08c8aa6b2c691f8a8d18c' 
  AND token = 'QP86pIxX74Amyq67zAD3uRhb83szOiy+S9gfX/cd5bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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