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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73ce3d9d3ec33ab3d22bd7054ea30e8ad2b85565c0f7f76c21f67bf9a2e99e21' 
  AND token = 'WqrtY9g8Rk+fdus7NoSqtAUQAsp902uZus/kzBwF5y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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