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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bf5d41446327e4e22ba6a292c3dd54a1028ea66898003b67b7e81b2d12f3a51' 
  AND token = 'pzWZ91LINJVriZrLQyQ5XxXQXQbgP2+nlQX7bDeJBUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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