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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ff3ec36edfc2a6f45cad0af20460bc986f9645f68d65eb4cda06a3ee628153c' 
  AND token = '60UB8trN8TmET5WjWvK83LCHFcbDFDN+eMiyyZgaFV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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