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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '531c7b56373db5e144f768e41819bea3804384aa5535b3b94f67311b78713976' 
  AND token = '1xQohCm2dcykC9Ce1V5CFuXNCEzv2N/f5J6VNLgg20c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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