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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9296192173e6f7a31172249561ca2b97209ade71f34d1fe36d4de0ba89f1bfc2' 
  AND token = 'jsakAin9Ro3W9+GMArim7JCWdDpTGvtpl2/uZ/OJARw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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